ASTM D1618-99(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1618–99 (Reapproved 2004)
Standard Test Method for
Carbon Black Extractables—Transmittance of Toluene
Extract
This standard is issued under the fixed designation D1618; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus and Reagent
1.1 This test method covers the measurement of the degree 5.1 Spectrophotometer, with tungsten filament lamp, 20-nm
of toluene discoloration by carbon black extractables and is maximum spectral bandpass, capable of measuring percent
useful in controlling the reaction processes for production of transmittance at a 425-nm wavelength. The instrument is to be
carbonblack.Thistestmethodmaynotbeapplicabletocarbon operated in accordance with the manufacturer’s directions for
blacks with high extractables. optimum performance.
1.2 The values stated in SI units are to be regarded as 5.2 Cuvets,rectangular,withanopticallightpathof10mm.
standard. 5.3 Balance, analytical, with a sensitivity of 60.01 g.
1.3 This standard does not purport to address all of the 5.4 Oven, gravity-convection type, capable temperature
safety concerns, if any, associated with its use. It is the regulation within 61°C at 125°C and temperature uniformity
responsibility of the user of this standard to establish appro- within 65°C.
priate safety and health practices and determine the applica- 5.5 Pipet, automatic, bottle-type, 20 cm , with a repeatabil-
bility of regulatory limitations prior to use. ity of 60.1.
5.6 Erlenmeyer Flasks, 125 cm with ground-glass stopper.
2. Referenced Documents
5.7 Filter Paper, qualitative grade, medium retention,
2.1 ASTM Standards:
medium-fast filter speed, 150-mm diameter.
D1799 Practice for Carbon Black—Sampling Packaged 5.8 Glass Filtering Funnels, 75-mm inside diameter at the
Shipments
top.
D1900 Practice for Carbon Black—Sampling Bulk Ship- 5.9 Beakers,50or100cm , with pouring lips.
ments
5.10 Wiping Paper, lint-free.
D4483 Practice for Evaluating Precision for Test Method 5.11 Cotton Swabs.
Standards in the Rubber and Carbon Black Manufacturing 5.12 Fume Hood, fully enclosed on three sides, with spark-
Industries
proof fan and motor.
5.13 Toluene, analytical reagent grade.
3. Terminology
6. Sampling
3.1 Definition:
3.1.1 carbon black toluene discoloration, n— the transmit- 6.1 Samples shall be taken in accordance with Practice
tance, at 425 nm, of the filtrate obtained from the toluene
D1799 or Practice D1900.
extract of carbon black, compared to that of pure toluene.
7. Standardization of Apparatus
4. Significance and Use
7.1 Turn on the spectrophotometer and allow it to warm for
4.1 The toluene discoloration value provides an estimate of the length of time specified by the manufacturer.
toluene-soluble discoloring residues present on the carbon
7.2 Check the zero reading of the spectrophotometer in
black. accordance with the manufacturer’s instructions, and adjust if
necessary.
7.3 PlacethefunnelwiththefilterpaperintoanErlenmeyer
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
Black and is the direct responsibility of Subcommittee D24.31 on Non-Carbon
flask. Filter approximately 30 cm of toluene into the flask and
Black Components of Carbon Black.
stopper the flask.
CurrenteditionapprovedJuly1,2004.PublishedJuly2004.Originallyapproved
7.4 Pour a portion of the toluene into the beaker with the
in 1965. Last previous edition approved in 1999 as D1618–99. DOI: 10.1520/
pouring lip for simplifying the transfer of the toluene to the
D1618-99R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cuvet.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D1618–99 (2004)
7.5 Rinse the cuvet with the filtered toluene three times, 10.2 The precision results in this precision and bias section
filling approximately one third full each time. Discard this give an estimate of the precision of this test method with the
rinsing toluene into an approved safety container. materials used in the particular interlaboratory program de-
scribedbelow.Theprecisionparametersshouldnotbeusedfor
NOTE 1—Thecuvetmustbehandledontheground-glasssidesonly.Do
acceptance or rejection testing of any group of materials
not touch the smooth, clear sides with the fingers.
without documentation that they are applicable to those par-
7.6 Fill the cuvet and wipe the outside surfaces with the
ticular materials and the specific testing protocols of the test
lint-free wiping paper while holding the cuvet in front of a
method. Any appropriate value may be used from Table 1.
suitable light source.The toluene must be free of any contami-
10.3 A type 1 inter-laboratory precision program was con-
nants,suchaslintparticles,whichmightcauselightscattering,
ducted as detailed in Table 2. Both repeatability and reproduc-
thusinfluencingthetestresults.Ifnecessary,rewipetheoutside
ibility represent short-term (daily) testing conditions. The
until perfectly clean, or clean the inside surfaces with a cotton
testing was performed using two operators in each laboratory
swab. Repeat 7.5 if the inside surfaces are cleaned.
performing the test once on each of two days (total of four
7.7 . Insert the cuvet into the spectrophotometer and adjust
tests). A test result is the value obtained from a single
it to read 100% transmittance at the 425-nm wavelength.
determination. Acceptable difference values were not mea-
sured. The between-operator component of variation i
...